Doorlock



May 20 '41924,

s. D. BUTTERwoRTH -DooRLo'cK..

Filed June 16; .1922 y gnenfofc Slim/EL 27. BUTTER warm Game# PatentedMay 2G, 1924.

istie SAMUEL D. BUTTERIVG'RTH, OF LANSING, MICHIGAN.

DOORLOCK.

siding` at Lansing` in the county of Ingham` and State of Michigan7 haveinvented certain new and useful Improvements in Doorlocks7 of which thefollowing is a specitication.

This invention relates to locks and has for its object a simple lock ofcheap construction which is especially adapted for screen doors or otherclosures where a cheap but effective lock is desired.

It is the object of this design of lock to provide a bolt that requiresno retractor and which may be dead-locked against retraction to form asuitable lock to prevent the opening` of the door.

The lock has a sliding bolt provided with a rubber head which forms notlonly a latch but a buffer to prevent the slamming of a screen door bythe ordinary spring that is attached to it. The slamming of'screen doorsis a very objectionable practice but is inherent in almost all screendoors. due to the employment of a spring for closing them. Variousdevices in the way of buffers have been used to obviate this noise. Mylatch not only obviates the noise by providing a suitable buffer, butpositively holds the door closed by a latch action.

Furthermore. this latch and buffer is of such construction that it maybe very easily dead-locked so as to provide a lock for the door andavoid the necessity of hooks or other locks that are commonly usedforthis purpose.

In the drawings Fig. 1 is an elevation of the lock showing the lockcasing.

Fig. 2 is an elevation of the lock parts with the cover plate removed.

Fig. 3 is a section on the line 3 3 of Fig. 2.

Fig. 4 is a section on the line 4 4 of Fig. 2.

Fig. 5 is a detail of one form of key that may be used.

The lock casing is made as cheaply as possible and comprises a faceplate a provided with lugs b turned inwardly. The rest yof the lock casecan be made of a shallow stamping with the flanges c. d, and e turned upto form the sides of the lock casing. while the body of the stamping fforms the front plate of the lock casing.

Application Yfiled June 16, 1922. Serial No. 568,685.

Out of the front plate the lugs g may be struck out to form guides forthe sliding` rods it. These rods connect with the slides that slidethrough the face plate and these in turn are connected by the cross barOn a pin the rubber roller on, is jour naled to turn, the front plate isforced out as at a and the. cover plate is forced out as at 0 to providea. socket of suiiicient proportions to permit the retreat of therollerinto the lock casing when it strikes the striker plate (not shown). Thecoil springs (I engage around the rods t to tend to project the boltoutwardly.

. The roller m being made of rubber or other soft deformable materialwill make no noise when it strikes the striker plate. In screen doors. acoiled tractile spring normally pulls the door closed with a bangagainst a door stop which is normally the only way to stop the door frompassing through the door opening, but with the construction I havedescribed the doorstep for the screen can be done away with entirely andthe roll fitting into the striker plate recess will stop the doorwithout any noise whatever. the roll being of rubber, obviously therewill be no noise due to the contact. The screen door may be opened bygiving it a good pull on a suitable handle for this purpose (or a pushfrom the inside).

I-Iowever, it is often desirable to lock screen doors on the inside.This can be Vvery easily done-or for that matter the door may be lockedfrom the outside-an uncommon thing for screen doors. The cover plate nand'ffont plate f are each provided with a circular opening s in whichare rotatably supported the hub ends ofthe dead-locking member t. Thishubis provided at each end with a key socket tl/adapted to beirregularly formed to take an irregularly formed end of a key 100. Eachof these openings s is provided with two olfset slots c one-fourth of aturn removed from each other, this permits the insertion of a key withirregular end such as shown in Fig. 5, the point 7/ of the key goinginto the recess e in the hub while the slot 101 in the side of the keypermits the key to straddle the segment 1 around. the openings s. Thisarrangement of two offset recesses 90 apart is a very important featureof the dead-locking of this lock7 which requires the dead-locking leverto be turned through a complete quarter of a turn, no more and Yandspring 2 is such as to always give a complete and full quarter turn andno more before the key can be extracted.

Of course it is old to dog a latch bolt with a beveled head but thepurpose of this isrnot to prevent the opening ot the door by pushing orpulling on the door but by reti-acting the bolt with the usual rollback.I use the dead-locking` member to )revent the door from being pushed orpulled open.V Hence the combination oit the deadloeking member withabolt having aroller strike portion is a new one accomplishing newresults.

Y What I claim is:

f l. In a lock, the combination of a casing, provided with a front plateand cover plate each having an opening therein provided with olset slotss aced about 90 a slidin@VV bolt sliding in said case7 means foryieldingly projecting said bolt, a dead-locking member having a hubportion j'ournaled in said openings in the coverI and front plate andhaving its ends recessed to receive a key, and a key that lits into theends ot said hub member and is provided with a slot to straddle theeasing segment between the two offset slots to prevent thewithdrawal ofthe key until a complete quarter turn is taken, said dead-looking memberhaving a Vportion adapted to engage a portion of the bolt to prevent theretraction or" the same when in 'one position.

Q. In a lock, the combination otl a easing` provided with a front plateand covcrplate each having an opening therein provided with offset andspaced slots, a slidingbolt sliding in said case, means for yieldinglyprojecting said bolt, a dead-locking'member having a hub portionjournaled in said openings in the cover and .front `plate and having itsends recessed to receive a key, and

a key that lits into the ends of lsaid hub Y member and is provided witha lateral projection adapted to engage under the easing segment betweenthe offset slots to prevent the withdrawal of the key until the requireddegree of turn is taken, said dead-locking memberhaving aportion adaptedto engage a portion o1 the bolt to prevent the retrac-4 tion oit thesame when in one position.

, In testimony whereof I ai'lix my signature.

